Since I work at my hospital I delivered in, I knew pretty much what to pack/not pack. The one thing I never thought to buy I did end up needing which was a Nipple Sheild, but luckily they provided me one.
Here are the things I found most useful that I DID pack-
Pillow, Dark Clothes, Chap-stick (my lips were so dry after pushing and breathing through contractions). My hospital provides the next few things, but if yours doesn't or are not sure, bring them, you'll use them at home anyways: WitchHazel Pads, Dermaplast (or similar aerosol antiseptic spray. Felt so good especially after my 3rd degree tear) Bring Granny Panties

I brought some but didn't end up using them as I prefereed the big mesh undies they give you because the maternity pads wouldn't have fit so nicely in the granny panties, however, if your hospital doesn't do the mesh undies or you just don't like them, make sure to bring underwear you don't like in a size bigger than you are.
That's all I can think of for now. Good luck everyone waiting on LO's